Question

calculate the number of molecules in 20 gram of water . plzz answer​

Answer 1

Answer:

6.68 × 10^ 23 molecules...

Answer 2

The number of molecules present in 20 g of water is 1.11 mole

Explanation:

Given: 20 g of water

To find: Molecules present in 20g of water

Formula used: $Number of moles = \frac{Given mass}{molar mass}$

Solution:

Molar mass of water($H_{2}O$) = 2 x H + O

2 x 1g/mol + 16g/mol

= 18 g/mol

mass = 20 g

molar mass = 18g/mol

Number of moles = given mass/ molar mass

= 20g /(18 g/mol)

= 1.11 mol

Number of moles = 1.11 mol

Final answer:

The number of molecules present in 20 g of water is 1.11 mole

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